June 30, 1934 was the Night of the Long Knives, Hitler’s purge of those standing in his way.
That time the FBI tested for Bigfoot.
June 28 is the anniversary of both the event that started and the treaty that ended World War One.
Bathing Machines Of The 19th Century.
Medieval medical schools.
ICYMI, most recent links are here, and include is the anniversary of the 1815 Battle of Waterloo, some really huge spiders, Chinese scientist-recommended pick up lines (personal favorite — “Your smile is a naughty goblin”), and the history of adhesives.